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Welcome back.

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In today's lecture, we are going to work on lecture, seminar, exercise solutions.

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So why are we going to do this?

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Because this one is pretty much complex.

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It will involve arrays, objects, if conditions and logical operators.

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So if you know how to do this and if you have done it, then Mark this lecture is finished and move

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on.

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If not, just create here new file called Lecture seven Exercise Solutions and link the same one here

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in your index.

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Right.

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Because we need to check what is going to happen in the browser.

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Also make sure that from a final folder, just grab this exercise lecture seven exercise judges read

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the entire thing.

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I just copy this, the whole thing.

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And I put it here.

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Right.

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That's it now.

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And.

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Copy this for.

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Put them here and let's make them as a comment, don't create a variable array that will be empty and

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it will halt user objects in future.

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Very good variable database.

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Equal, an empty array, nice next one from the user to enter his name and store it in a very real username

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var user name and prompt.

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Very good.

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Now inside the prompt.

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We had one argument.

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Call your name nice.

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So copied.

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This one is going to be similar because oops.

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Because here we are prompting the user name.

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Use it to user to enter his user email in your email address.

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Now here will provide the user to get his passport and save it as a user password variable.

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Right.

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Nice.

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OK, comes along and see what we have, so council log, they use pirnie email.

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Let's start with the name user email and user password and let's see if we are going to get the right

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output.

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So your name?

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Rick Password.

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Email are at Gmail dot com and one, two, three, four.

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Password hit enter.

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And why don't have here?

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Hmm, strange.

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Save it again, sometimes this can happen.

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Did I linked it correctly?

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Yes, I did.

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Name, Rick.

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Email address are at Gmail dot com.

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You can put any email address 1-3 here it is now it's working, right?

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I didn't change anything.

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I need to receive it.

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Good.

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Now, what is number five?

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Number five is create a function called the register that will take three arguments from the prompt.

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So function oops register.

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That will take three arguments.

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It will be name, email and password.

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Very good.

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Now this function, what it needs to do.

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Very good.

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Let me just do it like this field, the database with a user object that will contain the three fields.

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Nice.

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So we need to create an object in our database array.

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So how are we going to do this database that push it inside?

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We're going to create an object.

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Very good.

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So name it will be the name that is coming from our arguments then comma.

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We will have email that will come from email.

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Very good.

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And you can name this whatever you want.

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And we want to have a password.

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Now this will be the field name inside the object right in the past is coming from the function that

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we're going to pass.

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Nice.

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Oops.

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Here needs to go semicolon now, call the register, function, the prompt, whatever we stored here,

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write.

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And we know that they're working because we check them, we can lock them like a minute ago, the email

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and user password.

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Very good.

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Save it.

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Save a couple of times.

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Refresh it here on what's happening.

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Your name, Rick, very good, are sick Gmail dot com.

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OK, one, two, three, four, three, doesn't matter.

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Let's check the database.

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Mm hmm.

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I do see that some object is created and there you go.

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We do have our first object stored in a database array.

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Congratulations.

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So let me just do this console like I hate with this out of complete control, the lock, the database

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array.

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Now, I don't need to type it here all of the time.

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OK, now what we are going to do is we are going to move on.

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So six is done, seven canceling the prom and see what will happen.

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Do you get database with null or empty values?

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How we can fix this.

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Nice.

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So let's cancel the proms.

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Cancel.

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Cancel.

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Here is I do have an array with no object that is crazy, right?

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Why?

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Because this function was called and doesn't matter what was inside here, it was nothing, actually.

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And it was called with the with those empty values.

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And we pushed into the database, all of those things.

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So now we need to fix it.

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How are we going to fix it?

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So I'm going to do like this seven, eight and nine.

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We are going to do in one go.

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So we're going to do if conditions with this condition, we're going to check if the user name is different,

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then no, very good.

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And we need to use the logical operator end user email is going to be different then no end user password

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needs to be.

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Different than no, very good what this means that I want each and every of these variables to have

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some data.

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That's why these and otherwise, if you put or hear the pipe then means that these two needs to be filled.

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And this one not in.

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That is not what we want.

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So here it will go.

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Only if this contains data.

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And if not, we're going to have this condition and we're going to alert the user and say some of the

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form fields.

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Actually, we don't have form, but let's do it are empty.

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Please try again.

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Very good.

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Now, here the logic goes like this.

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Any time we're going to call this register function is only when these variables hold any meaningful

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data, they will not be known.

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Right now, let's hit it here, refresh it and cancel everything first.

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Here it is.

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Some of the fields are empty.

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Please try it again.

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Yeah.

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You need to clear a couple of times, probably now our alert is working because we were trying to register

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and now the database, if we try to access that database, it will not work because this alert is there.

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Right?

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That database is empty.

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OK, now let's do a real Rick or am Gmail dot com and very good.

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We have a database.

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Get our M Gmail dot com.

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One, two, three, four.

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Nice.

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So that is pretty much what we want to do in the six, seven and eight.

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In nine, actually, they put it like that, six, seven, eight, nine.

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So how we can fix it, we already fix it.

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Try saving the database user objects only when.

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Yeah, this was number 10 as well.

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Oh, we have covered a lot.

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Now check if the name of the user object.

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So the name of this object.

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So if it's righ right.

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An object in a database is the same with the name of the user name that we got from the prompt in here

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from.

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Guess if he has done this play, welcome to the profile page, dear.

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Name of the user.

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Nice.

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So that will be another issue here if.

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Databased.

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So how many actually, let me just write down, because I refresh it, Rick.

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Email our Gmail dot com.

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Onto three.

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I get now in our database, we always going to have only one registered user, and why is this?

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Well, because when they save it and a refresh and the compiler gets to this line and it sent the database

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back to empty, that's why.

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OK, so the database of zero.

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And I want to access the name, that name is equal equal to what?

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The username variable.

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So whatever this variable holds, it needs to be the same with this one.

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If that is the case, then what we need to do is saying cancel that log.

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Welcome to your profile page, dear.

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Make a breathing space username.

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And else, let's put alert here.

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Something.

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Went wrong.

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Please try again later.

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And that's pretty much it.

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So we hear, Rick.

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Email break at Hotmail dot com.

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Very good.

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Welcome to your profile page, d'Afrique.

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Everything is working, our database array holds one object crazy.

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Now congratulations.

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You know how to do it fails conditions.

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You know now how to push through the database on object and now you know how to deal with objects.

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Crazy.

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That is super.

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I really enjoy having you as my student.

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If you are here, that means that you're doing something great.

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So I will see you in the next one.

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And don't get don't get scared.

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It will get better in time.

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So just please practice and let's fix this problem here.

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Email right now.

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So, yeah, I'm sorry if I see some mistake here.

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I mean this.

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Language mistake and yeah, we'll try to fix it in the final solutions folder, right.

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So see you in the next one.

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And stay safe, but.